Considering the fact that the rule of coding in Chinese characters key board input methods coexists with various Chinese
coding methods in keyboard inputting and the efficiency of inputting, we put forward another new kind method of Chinese coding termed U code. The U code is based on sound form mode ( sound :the sound in sound form mode represents the first letter in pingyin of Chinese characters; and the form is selected from the fifty common unit parts or
components which form the Chinese characters, which are the unit codes),projecting 26 English letters of those on the keyboard according to the rule of pronunciation of the parts or the components and the rule of similarity among the parts of Chinese characters, they poses the characteristics of regulations between the 26 English letters of the input key board units and the parts and components of Chinese characters. And the U code has reduced the number of code
repeating and reappearing within 6 under the condition of decreasing the premise of the code repeating, which has made up the disadvantages of low speed of current operation of cell phone because of the high possibilities in code repeating. So the U code posses a obvious convenience in transplanting to cell phone. The longest code in U code input method is 4, and the average length of the codes is 1.598, the rate of key choosing is 11.021%.